std::is_member_function_pointer

 

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Defined in header <type_traits>
template< class T > struct is_member_function_pointer;		(since C++11)

If T is pointer to non-static member function, provides the member constant value equal true. For any other type, value is false.

Inherited from std::integral_constant

Member constants

value [static]	true if T is a member function pointer type , false otherwise (public static member constant)

Member functions

operator bool	converts the object to bool, returns value (public member function)

Member types

Type	Definition
value_type	bool
type	std::integral_constant<bool, value>

Possible implementation

template< class T > struct is_member_function_pointer_helper : std::false_type {};   template< class T, class U> struct is_member_function_pointer_helper<T U::*> : std::is_function<T> {};   template< class T > struct is_member_function_pointer : is_member_function_pointer_helper< typename std::remove_cv<T>::type > {};

Example

run this code

#include <type_traits>
 
class A {
    void member_function() { }
};
 
int main()
{
    // fails at compile time if A does not contain member_function as a function.
    static_assert(std::is_member_function_pointer<decltype(&A::member_function)>::value,
                  "Class does not contain member."); 
}

See also

is_pointer (C++11)	checks if a type is a pointer type (class template)
is_member_object_pointer (C++11)	checks if a type is a pointer to a non-static member object (class template)
is_member_pointer (C++11)	checks if a type is a pointer to a non-static member function or object (class template)